EP1022539B1 - Analog quantity measuring method for a cylinder gauge - Google Patents

Analog quantity measuring method for a cylinder gauge Download PDF

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Publication number
EP1022539B1
EP1022539B1 EP00100753.3A EP00100753A EP1022539B1 EP 1022539 B1 EP1022539 B1 EP 1022539B1 EP 00100753 A EP00100753 A EP 00100753A EP 1022539 B1 EP1022539 B1 EP 1022539B1
Authority
EP
European Patent Office
Prior art keywords
analog
value
tolerance
display
minimum value
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP00100753.3A
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German (de)
English (en)
French (fr)
Other versions
EP1022539A3 (en
EP1022539A2 (en
Inventor
Koji Sasaki
Yoshitaka Kuji
Yuichi Ichikawa
Mikio Suzuki
Norihide Tsuyuki
Hiroyuki Ohta
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitutoyo Corp
Original Assignee
Mitutoyo Corp
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Filing date
Publication date
Application filed by Mitutoyo Corp filed Critical Mitutoyo Corp
Publication of EP1022539A2 publication Critical patent/EP1022539A2/en
Publication of EP1022539A3 publication Critical patent/EP1022539A3/en
Application granted granted Critical
Publication of EP1022539B1 publication Critical patent/EP1022539B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B3/00—Measuring instruments characterised by the use of mechanical techniques
    • G01B3/002—Details
    • G01B3/004—Scales; Graduations
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D7/00—Indicating measured values
    • G01D7/002—Indicating measured values giving both analog and numerical indication

Definitions

  • the present invention relates to an analog quantity display method for displaying a measured analog quantity such as the size or shape of an object to be measured, an analog quantity measuring method for measuring the analog quantity, and a digital/analog display type measuring instrument for measuring an analog quantity such as the size or shape of an object to be measured.
  • digital/analog display type measuring instruments such as dial gauges use a CRT display or a liquid crystal display to display a scale and a pointer as pictures or graphics in order to display results of measurements by analog display.
  • the present assignee has proposed a digital/analog display type measuring instrument which allows both digital and analog measurements to be effectively executed even with omission of premeasurements using a gauge block, by Japanese Laid-Open Patent Publication (Kokai) No. 10-132546 . That is, the proposed digital/analog display type measuring instrument has a large number of pointer segments arranged along a scale which indicate a measured value, and Is characterized by including a switch which can independently switch an analog scale interval (weight per pointer segment), and a switch which can set a reference (zero) point for analog display at an arbitrary position of a probe.
  • the proposed digital/analog display type measuring instrument which is used as a dial gauge or the like, displays the present measured value by lighting one of the large number of pointer segments arranged along the scale, thereby requiring the display to be relatively large in area.
  • this instrument has a plurality of switches or the like for switching the analog scale interval and setting the reference point for analog display, resulting in a considerably large-sized display section.
  • the above conventional digital/analog display type measuring instrument has the disadvantage that if this measuring instrument is designed as a cylinder gauge for operation in a relatively small space, the display section of the gauge body has to be incomparably larger than the probe section. Therefore, this measuring instrument cannot be easily handled.
  • US 4,505,042 discloses that within a range of zero plus or minus tolerance values, a minimum set scale interval can be used and, out of the range of zero plus or minus the tolerance values, the scale interval is enlarged, so that a range of dimension indication can be expanded.
  • JP 10132546 discloses that digital display zero reset and analog indicator zero reset are sequentially executed, and then a present digital value replaces an analog indicator zero setting position so as to update the analog indicator zero setting position if a zero reset switch is turned on in the case where an amount of displacement of a spindle is so large that a present digital value exceeds a plus side limit of an analog displayable range.
  • US 4,748,404 discloses that an automatic control of always displaying a measuring range section in which an instantaneous measurement value falls approximately on the center of a scale.
  • EP 0031716 discloses an analog and digital display device displaying segments activated up to a value to be indicated in the manner of a bar graph
  • US 4,247,855 discloses displaying an analog value in a bar graph fashion by changing a segment electrode from the bleached state to the coloration state.
  • FIG. 1 shows a cylinder gauge to which the present invention is applied and which is used to measure the bores of cylinders.
  • the cylinder gauge has a spindle (support) 2 pivotably supported on a gauge body 3 and having a probe 1 attached to one end thereof. The displacement of the probe 1 is displayed in both a digital display section 11 and an analog display section 12 of a liquid crystal display 10 in the gauge body 3.
  • the digital display section 11 is comprised, for example, of 7-segment electrodes for a + or - sign and six digits for numerically indicating the displacement of the probe 1 so that the numerical value of displacement of the probe 1 can be directly read.
  • the analog display section 12 is comprised of a bar graph 13 formed of a large number of analog bars arranged in juxtaposition in a transverse direction as pointer segments.
  • the displacement of the probe 1 is displayed by selectively reversely lighting the analog bars in such a manner that the analog bar at the right end indicates a maximum display value.
  • a minimum value is displayed by flickering one analog bar, and upper and lower limit values of a set tolerance are displayed in a lighting state which is inverse to the lighting state of the analog bars indicating the present displacement.
  • a start switch 14 for starting measurements a tolerance setting switch 15 for setting a tolerance
  • a preset switch 16 a hold switch 17 for fixing a held value
  • a M/W switch 18 an ON/OFF switch, etc.
  • the gauge body 3 has a length measuring sensor 50, shown in FIG. 2 , built therein for converting the displacement of the spindle 2 following the displacement of the probe 1, into an electrical value. Output pulse signals from the length measuring sensor 50 are counted by a length measuring circuit (counter) 51 and output, for example, as binary coded decimal signals.
  • An output from the length measuring circuit 51 is input to an arithmetic and control section 52, which in turn controls the length measuring circuit 51 and a liquid crystal drive section 56 based on operations of a group of control switches 20.
  • a ROM 54 stores an arithmetic and control program for this control.
  • a RAM 55 stores various data which are required to operate the arithmetic and control section 52 based on the arithmetic and control program.
  • the liquid crystal drive section 56 is comprised of a digital display driver 57 and an analog display driver 58 for driving the digital display section 11 and the analog display section 12 of the liquid crystal display 10, respectively.
  • the arithmetic and control section 52 compares a count value from the length measuring circuit 51 with a calibration value or a bar graph-displayed minimum value and updates a control signal provided for the analog display driver 58, that is, an offset of a bar graph-displayed value depending on a result of the comparison, as described below.
  • FIG. 5 shows an operating procedure carried out to calibrate the cylinder gauge using a reference ring (not shown) and then measure a workpiece.
  • the present procedure is started, and then, at a step S20, the cylinder gauge is powered on to enter a measurement mode when the ON/OFF switch 19 is depressed.
  • step S30 the operator checks whether or not calibration is required. If calibration is required, the process transfers to a step S40, in which when the M/W switch 18 is depressed, the cylinder gauge enters a master adjustment mode (calibration mode).
  • the preset switch 16 is used to input a value related to the reference ring (calibration value), and then the start switch 14 is depressed to prepare for measurement of the reference ring (start of a minimum value hold function) (step S55).
  • step S60 the cylinder gauge is used to measure the reference ring and a minimum value is determined using the minimum value hold function.
  • the preset switch 16 is depressed (step S70) to update the offset of the bar graph-displayed value in the liquid crystal display 10 such that the position of the minimum value determined at the step S60 becomes equal to the calibration value.
  • the updated offset value is equal to the last or old offset + (the minimum value - the calibration value).
  • step S80 After the updating of the offset to the new offset, at a step S80, when the M/W switch 18 is depressed, the calibration gauge is switched to the measurement mode.
  • step S90 the operator checks whether or not setting of a tolerance, that is, the upper and lower limit values of the tolerance is required. If the setting is required, the process proceeds to a step S100.
  • the tolerance setting switch 15 is depressed to prepare for inputting of an upper limit value, and at a step S110, the tolerance setting switch 15 is operated to input the upper limit value. Then, when the tolerance setting switch 15 is depressed at a step S120, inputting of a lower limit value is prepared, and at a step S130, the tolerance setting switch 15 is operated to input the lower limit value.
  • step S150 the operator determines whether or not a workpiece measurement operation is to be performed. If the operation is to be performed, then at a step S160, the start switch 14 is depressed to prepare for workpiece measurement (start of the minimum value hold function).
  • the cylinder gauge is used to measure the diameter of a workpiece (a minimum value is determined using the minimum value hold function), and the measured diameter value is set as the measured value. Then, at a step S180, the start switch 14 is depressed to complete the minimum value hold function.
  • step S190 the operator checks at a step S190 whether or not the measurement has been completed. If the measurement has been completed, then at a step S200, the ON/OFF switch 19 is operated to terminate the operation and the cylinder gauge is powered off to terminate the process (step S210). In this case, to further continue the measurement, the process returns to the step S10.
  • the preset switch 16 is operated to input the calibration value
  • the tolerance setting switch 15 is manually operated to input the upper and lower limit values.
  • FIG. 6 shows a digital/analog-display procedure for displaying a count value using the minimum value hold function.
  • the present count value is stored in a minimum-value variable area of the RAM 55 as a minimum-value variable at a step S310 to prepare for measurement (the simple term "minimum value" in the following description refers to the value stored as this variable).
  • a step S320 all the bar segments of the bar graph starting with a maximum display value (located at the right end of the bar graph) and ending with the present count value are lighted.
  • a maximum display value located at the right end of the bar graph
  • the method of displaying a corresponding area provides a higher visibility for a small-sized display.
  • step S330 to flicker a bar segment located at a position corresponding to the minimum value as shown in FIG. 3A .
  • the corresponding bar segment may be displayed in different colors.
  • step S340 it is checked whether or not the present count value is smaller than the minimum value. If former is smaller than the latter, the process proceeds to a step S350. Otherwise, the process returns to the step S320.
  • the present count value is stored in the minimum-value variable area of the RAM 55 and digitally displayed as a minimum value (step S360).
  • a step S370 it is checked whether or not a tolerance has been set. If the tolerance has been set, a step S380 and subsequent steps are executed.
  • the display of bar segments at the tolerance positions (upper and lower limit values) of the bar graph is reversed (as shown in FIG. 4A ). That is, the reversal in this case means that lighted bar segments are put out, or dark bar segments are lighted, but for a display having a color bar graph, the bar segments may be displayed in different colors.
  • step S390 it is checked whether or not the present count value digitally displayed as the minimum value is smaller than the set tolerance lower limit value (step S390), and if the present count value, that is, the minimum value is smaller than the tolerance lower limit value, the process proceeds to a step S400 to light a lower-limit excess mark ( ⁇ ) ( FIGS. 4A, 4B, and 4C ). If the result of the checking shows that the present count value is not smaller than the tolerance lower limit value, the lower-limit excess mark ( ⁇ ) is not lighted or extinguished (step S410).
  • step S420 it is checked at a step S420 whether or not the present count value is larger than the set tolerance upper limit value. If the former is larger than the latter, an upper-limit excess mark (>) is lighted (step S430). If the present count value is not larger than the tolerance upper limit value, the process proceeds to a step S440 to extinguish the upper-limit excess mark (>).
  • a step S450 it is determined whether or not the minimum value is within the tolerance range, that is, the lower limit value ⁇ the minimum value ⁇ the upper limit value. If the minimum value is within the tolerance range, the process proceeds to a step S460 to light an in-tolerance mark ( ⁇ ), which is shown in FIG. 1 .
  • the in-tolerance mark ( ⁇ ) is not lighted. If, however, the check for a tolerance setting at the S370 determines that no tolerance has been set, then at a step S480, none of the in-tolerance mark ( ⁇ ), the lower-limit excess mark ( ⁇ ), and the upper-limit excess mark (>) is lighted, as shown in FIGS. 3A, 3B, and 3C .
  • step S490 it is checked whether or not the present count value is smaller than the bar graph-displayed minimum value. If the former is smaller than the latter, the process proceeds to a step S500 to change the offset of the bar graph-displayed value such that the minimum value is located at the center of the bar graph. That is, the bar graph cannot display the overall count area but can display only a range between C and C + R, where "C” denotes the offset of the bar graph-displayed value, and "R” denotes the display range of the bar graph.
  • step S500 is not executed, whereby the offset of the bar graph-displayed value is not changed and only the tolerance values and their neighborhood, which will be described below, are displayed in the bar graph.
  • the flowchart in FIG. 5 requires the procedure of the step S60 to be executed for calibration while requiring the procedure of the step S170 to be executed for measurement, so that the start switch 14 has to be depressed each time the minimum value hold function is resumed.
  • "Automatic updating of held minimum value” avoids troubles involved in this resumption procedure.
  • "Automatic updating of held minimum value” is a function of automatically updating the held minimum value, and this function automatically averages a plurality of automatically updated minimum values to determine a measured value.
  • FIG. 7 is a flowchart of the operation of "Automatic uploading of held minimum value”.
  • step S630 it is determined whether or not the present count value is smaller than the present value of the minimum-value variable Mi. If the former is smaller than the latter, the process proceeds to a step S640 to update the value of the minimum-value variable Mi to the present count value.
  • the process proceeds to a step S650 to determine whether or not the present count value is larger than the present value of the minimum-value variable Mi by a fixed value ⁇ or more. If the former is larger than the latter, it is determined that the minimum value hold function should be resumed, that is, the minimum value held at the step S620 or S640 should be updated. Then, the process proceeds to a step S660, where the plurality of minimum values (M0, M1, M2, .7) are averaged to set the average value obtained as the measured value, and then the variable (i) incremented by one at a step S670. Subsequently, the process returns to the step S620 to again execute the operation starting at the step S620.
  • a step S650 determines whether or not the present count value is larger than the present value of the minimum-value variable Mi by a fixed value ⁇ or more. If the former is larger than the latter, it is determined that the minimum value hold function should be resumed, that is, the minimum value held at the step S620 or S640 should be updated
  • This procedure of FIG. 7 enables the minimum value hold function to be resumed by simply determining the minimum value a number of times and without the need of any switch operation, while enabling a plurality of minimum values to be automatically averaged to determine the measured value, thereby not only facilitating workpiece measurement or calibration but also improving measuring reliability.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)
  • Length-Measuring Instruments Using Mechanical Means (AREA)
  • Indicating Measured Values (AREA)
EP00100753.3A 1999-01-19 2000-01-14 Analog quantity measuring method for a cylinder gauge Expired - Lifetime EP1022539B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP11010003A JP2000205852A (ja) 1999-01-19 1999-01-19 デジタルアナログ併用表示型測定器のアナログ量測定・表示方法
JP1000399 1999-01-19

Publications (3)

Publication Number Publication Date
EP1022539A2 EP1022539A2 (en) 2000-07-26
EP1022539A3 EP1022539A3 (en) 2002-01-02
EP1022539B1 true EP1022539B1 (en) 2016-11-16

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EP00100753.3A Expired - Lifetime EP1022539B1 (en) 1999-01-19 2000-01-14 Analog quantity measuring method for a cylinder gauge

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US (1) US6412187B1 (ja)
EP (1) EP1022539B1 (ja)
JP (1) JP2000205852A (ja)
CN (1) CN1159567C (ja)

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Publication number Priority date Publication date Assignee Title
US10859363B2 (en) 2017-09-27 2020-12-08 Stanley Black & Decker, Inc. Tape rule assembly with linear optical encoder for sensing human-readable graduations of length

Also Published As

Publication number Publication date
CN1261660A (zh) 2000-08-02
US6412187B1 (en) 2002-07-02
JP2000205852A (ja) 2000-07-28
CN1159567C (zh) 2004-07-28
EP1022539A3 (en) 2002-01-02
EP1022539A2 (en) 2000-07-26

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